CN104392100A - Pollution source diffusion early-warning method based on water quality on-line monitoring system - Google Patents
Pollution source diffusion early-warning method based on water quality on-line monitoring system Download PDFInfo
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Abstract
The invention discloses a pollution source diffusion early-warning method based on a water quality on-line monitoring system. The method comprises the following steps of S01, monitoring water quality current situation of each monitoring station in an area in real time through the water quality on-line monitoring system; S02, confirming a pollution source being warned; S03, acquiring real-time monitoring data of excessive pollutants at the monitoring station where the pollution source is located; S04, selecting a river where the station is located to simulate a terminal; S05, inputting relevant parameters of a river section to be simulated; S06, calculating a one-dimensional steady-state water quality model; S07, rendering a pollutant concentration gradient for the simulated river section and carrying out early-warning information judgment. The one-dimensional steady-state model applied by the invention is independent of specific riverway geographic information and terrain parameters, only relates to hydrologic condition flux and flow velocity of riverways, can be automatically modeled according to GIS (Geographic Information System) information, and is strong in universality.
Description
Technical field
The present invention relates to water quality of river monitoring field, particularly relate to a kind of pollution source based on monitoring water quality on line system diffusion method for early warning.
Background technology
2009, Chinese Ministry of Environmental Protection issued " advanced Warning System for Environmental Monitoring builds outline (2010-the year two thousand twenty) ", proposed the Warning System for Environmental Monitoring wanting Speed-up Establishment advanced person in literary composition, pushed forward the history transition of environmental monitoring comprehensively.Pollution source on-line monitoring and early warning system are the important component parts of building advanced environmental warning system.The construction of early warning system is in the ascendant in China, in the urgent need to the various software facilities of auxiliary construction early warning system.
Based on the difference of application target, China's water safety warning system can be divided into the macro-level policy-making type early warning system (2) of three classes (1) for Regional Water Environment and water quality safety for the management type early warning system (3) of water environment or water pollution event for the type of production early warning system of water treatment production facility.It is uneven that the subject matter that current management type early warning system exists comprises basic staff quality, not in place to the operation and maintenance of instrument, and mass data can not obtain process in time etc., have impact on the Function of management type early warning system.
Pollution source early warning system belongs to the category of management type early warning system.In pollution source forewarning management, water quality model is one of important technical analyzing contamination impact.Water quality model is pollutant mathematical description of mutual relationship between Changing Pattern and influence factor thereof in water environment, and it is one of content of water environment scientific research, is again the important tool of Study of Water Environment.Water quality model relates to many Issues of Basic Theories of water environment science and many practical problemss of water pollution control.
Monitoring water quality on line system be one with on-line analysis instrument and laboratory study demand for service goal, to provide representative, the sample message of promptness and reliability is for core missions, use automatic control technology, computer technology be equipped with professional software, form one from sampling, pre-service, analyze the holonomic system of data processing and storage, thus realize the online auto monitoring to sample.Automatic monitoring system generally comprises sampling system, pretreatment system, Data Acquisition and Conversion System (DACS), on-line monitoring analysis meter, data processing and transmission system and remote data management center, these subsystems are each architectonical both, mutually cooperate again, to complete reliably running continuously of whole online auto monitoring system.
Network geographic information system (Web-GIS): refer to based on Internet platform, client application software adopts procotol, uses Geographic Information System on internet.General by many main frames, multiple database is connected on internet in a distributed manner with multiple client and forms.
In prior art, based on Geographic Information System (GIS), Online monitoring of pollution sources data message is combined with spatial geographic information, sets up monitoring and the overall analysis system of a large amount of online monitoring data such as Beijing's emphasis boiler smoke, sewage treatment plant two class primary pollution source and quality of water environment.System not only achieves real-time monitoring, data display, statistical study to major polluting sources online monitoring data, exceed standard the conversational traffic functions such as warning, also showing in pollution source diffusion simulations, carried out Primary Study in pollution source and the interactional spatial synthesis analysis of environmental quality information etc., is the technology trial of the pollution source monitoring management and automatic monitoring data that the improve Beijing further novelty that utilized level to make.But, need to rely on and concrete spatial geographic information, generalized information system automatic modeling can not be utilized, can not be general, there is larger limitation.
Equally, " based on the contamination monitoring early warning of water quality model and contingency management research " (. Wang Chengjin etc., northern environment, 2013,29 volume 5 phases) disclose a kind of contamination monitoring method for early warning based on water quality model, to set up based on water pollution diffusion model, propose a set of surface water pollution monitoring and early warning and Emergency management system in conjunction with China's surface water environment management status, still need to rely on and concrete spatial geographic information, have larger limitation.
Summary of the invention
The present invention proposes a kind of pollution source based on monitoring water quality on line system diffusion method for early warning, the present invention, to set up based on water pollution diffusion model, only relates to hydrologic condition flow, the flow velocity in river course, can according to GIS information automatic modeling, highly versatile.
Technical solution of the present invention is as follows:
Based on a pollution source diffusion method for early warning for monitoring water quality on line system, comprise the following steps,
S01, the water quality situation of monitoring water quality on line system to monitoring station each in region carries out Real-Time Monitoring;
S02, confirms the pollution source occurring to report to the police: receive the pollution source warning message that monitoring water quality on line system sends, check alert data, confirms transnormal items and times of ultra standard information that the pollution source website of reporting to the police occurs;
S03, obtains the monitoring station at pollution source place and to exceed standard the Real-time Monitoring Data of pollutant, comprise sewage draining exit wastewater discharge Q
ewith website Pollutant emission concentration C
e, as the input of one-dimensional stable water quality model water quality model analog computation;
S04, the selected monitoring station at pollution source place and the simulation terminal in river, described pollution source place that warning occurs, as waiting starting point and the terminal of simulating section, according to described starting point, terminal latitude and longitude information, river moves towards, river plane configuration, the topological relation that the GIS information of automatic monitor station distribution situation is carried out between river course, basin and each monitoring point builds, calculated by GIS spatial analysis and treat that simulation section length and step-length are arranged, in conjunction with one-dimensional stable water quality model, modeling is carried out to simulation of water quality task, to treat that segmentation is carried out according to step information in simulation section, numbering,
To the monitoring station at the pollution source place of reporting to the police be there is as starting point, choose the simulation terminal in river, pollution source place, can the flow direction in simulating pollution source, do not rely on concrete river course geographic information, terrain parameter, can according to GIS information automatic modeling, highly versatile.
S05, input and treat simulation section correlation parameter, specifically comprise the mean flow rate in river discharge, Mixing Coefficient in Rectangular Channels background concentration and river, for the calculating of one-dimensional stable water quality model provides data source, Mixing Coefficient in Rectangular Channels background concentration is water concentration C
p, the mean flow rate in river discharge and river is for calculating upland water design water yield Q
p;
S06, calculate pollutant overall attenuation coefficient, treat the initial section pollutant levels in simulation section, based on one-dimensional stable water quality model, along journey each step-length node pollutant levels value, analog computation is carried out to simulation section, the array of the numbering that described step S04 generates, step-length and described pollutant levels value composition, result of calculation returns to GIS, and this array is also as the data source (namely showing analog result in the mode of GIS thematic map and list) that interface list is shown simultaneously simultaneously;
S07, GIS map is carried out pollutant levels gradient to simulation section play up according to numbering, step-length, forms Pollutants Diffusion simulation thematic map, analog result is carried out GIS visual presentation, and according to predefined alarm regulation and strategy in advance, carry out pollution source early warning information and study and judge.
Warning message described in step S02 judges for carrying out analysis according to predefined alarm regulation and strategy, when out-of-limit situation occurs monitoring parameter, carry out the warning produced of reporting to the police, described warning message supports multiple alarm mode, comprise alarm window, push away picture, the warning of audio alert, mail, SMS alarm, telephone call.
Alarm regulation and strategy: according to Water-quality control target and the pollution level in region, section, website place, the upper lower limit value of each monitoring parameter alarm level is set respectively.
Described in step S04, GIS spatial analysis Computed-torque control comprises: wait the acquisition of simulating section starting point (sending the sewage draining exit monitoring point of warning) and simulation terminal (lower reaches of river) geographical latitude and longitude coordinates information; Wait the acquisition of simulating section other nodes (node except except starting point and terminal) GIS attribute field; Wait the topology calculate of simulating section length; The conversion of reality coordinate and screen coordinate; The conversion etc. of actual range and screen distance.
Step S04 one-dimensional stable water quality model carries out modeling to simulation of water quality task, comprises the following steps:
One-dimensional water quality model is relatively simple a kind of in water quality model, and be applicable to the small-sized river course that river mean flow rate U is less, the pollutant of side discharge can reach opposite bank in the short period of time, and can with river Homogeneous phase mixing; (S401) one-dimensional stable water quality model differential equation is formula (1):
Non trivial solution is formula (2):
In formula (in following bracket, content is unit corresponding to inventory): C is sewage draining exit downstream contamination substrate concentration (mg/L); X be defeated move distance (m); U is river mean flow rate (m/s); K is pollutant overall attenuation coefficient (1/d); Q
p, C
pfor upland water designs the water yield and water concentration (m
3/ s, mg/L); Q
e, C
efor sewage draining exit wastewater discharge and Pollutant emission concentration (m
3/ s, mg/L); Q
pfor upland water designs the water yield, the mean flow rate in the river discharge inputted by S05, river is calculated and obtains, water concentration C
pfor the Mixing Coefficient in Rectangular Channels background concentration of step S05 input,
for treating the initial section pollutant levels in simulation section; .
For the river that breadth depth ratio is little, pollutant in the short period of time, substantially can in section Homogeneous phase mixing, pollutant levels horizontal change on section is little, can calculate water environment capacity with one-dimensional water quality model simulating pollution thing along the migration problem of river longitudinal direction.
(S402) determine the comprehensive degradation coefficient K of pollutant: when Practical Project uses, according to the historical summary of concrete section, calibration can be carried out to K value, obtain that adjusted stream road is specific geographic, the K value of hydrological environment, improve the simulation accuracy rate of model.
According to the situation of reality, calibration can be carried out to parameter, model is demarcated.What adopt in general-purpose computations is that experimental formula is to calculate the comprehensive degradation coefficient of pollutant
Step S07 GIS visual presentation specifically comprises the following steps:
(701) analog result calculated by one-dimensional stable water quality model, as discrete points data, obtains the isogram of pollutant levels through difference arithmetic;
(702) described isogram is carried out pollutant levels gradient and color rendering, layer is played up in formation: the upper lower limit value that reference water quality classification specifies, pollutant times of ultra standard and user's request, by business rule, analog result is played up, ascending according to concentration value, river water color changes from shallow to deep;
(703) layer is played up in process: adopt precut mode to cut into slices to map, and stored on the server by the map image cut, shape map is cut into the tile map of different stage, with these tile map base map as a setting.The river of map file or the coordinate geography information in region and correlation attribute value is extracted by GIS service, and pass to backstage advanced analysis service-Engine and carry out analytical calculation, calculate the data type that rear basis returns simulation of water quality evaluation, and create analysis thematic river layer, pollutant levels information is divided according to analog computation, according to step-length, river special layer is played up, the map that is simultaneously added to by special layer carries out visual presentation.System adopts international GIS interface, based on general OGC international norm.
Pollution source early warning information is studied and judged and is comprised the following steps:
One-dimensional stable water quality model is calculated the section each step-length node pollutant levels value returned to contrast with simulation section, terminal place Water-quality control desired value, according to seriousness and the urgency level of the abrupt polluting accident that may cause, determine warning level, carry out grading forewarning system.
The displaying interface of grading forewarning system, by different color shows, is specially: general (iv level, blue); Heavier (iii level, yellow); Seriously (ii level, orange); Especially severe (i level, redness); Early warning information is sent in the mode of page warning pop-up box.Management unit judges to take corresponding contingency management measure according to early warning.
Compared with prior art, the present invention includes following beneficial effect:
1) be applicable to automatically monitor engineering construction: the present invention proposes the pollution source diffusion method for early warning based on water quality real time on-line monitoring system, in real time monitoring parameter is monitored, parameter is once out-of-limit, software sends warning in time, warning message is carried out dynamic calculation and analysis simultaneously, strengthen the real-time of environmental monitoring and the promptness of data analysis application; Early warning analysis method carries out model modeling based on river course GIS information automation extraction topological relation, set up the simulation of water quality diffusion model being embedded in Online monitoring of pollution sources early warning system by technology such as model interfaces, Fast simulation is carried out to the spread condition of downstream river course pollutant; The one-dimensional stable model that the present invention applies to does not rely on concrete river course geographic information, terrain parameter, only relates to hydrologic condition flow, the flow velocity in river course, can according to GIS information automatic modeling, highly versatile.
2) efficiency is higher: one-dimensional water quality model and WebGIS carry out integrated by the present invention, play up from the process of river characteristic information, river automatically complete along the calculating of journey pollutant levels, concentration gradient by the rule of system according to setting, make whole process efficiency and practicality high, early warning analysis result adopts WebGIS Geographic Information System, give Visual Dynamic to Calculation results to show, be convenient to dispose and maintaining and updating system, improve availability and the convenience of pollution source early warning system.。
3) system adopts B/S framework, and adopt OO development technique, com technique that database technology, GIS technology, web technology are converged to unified platform and manage, easy to operate, practicality is stronger.
4) local water quality model, each operation values selects one to predict section, and the model calculation time is shorter, reduces the requirement to computer configuration.
Accompanying drawing explanation
Fig. 1 is a kind of diffusion of the pollution source based on monitoring water quality on line system of the present invention method for early warning schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of diffusion of the pollution source based on monitoring water quality on line system method for early warning, comprises the following steps,
S01, the water quality situation of monitoring water quality on line system to monitoring station each in region carries out Real-Time Monitoring;
S02, confirms the pollution source occurring to report to the police: receive the pollution source warning message that monitoring water quality on line system sends, check alert data, confirms transnormal items and times of ultra standard information that the pollution source website of reporting to the police occurs;
S03, obtains the monitoring station at pollution source place and to exceed standard the Real-time Monitoring Data of pollutant, comprise sewage draining exit wastewater discharge Q
ewith website Pollutant emission concentration C
e, as the input of one-dimensional stable water quality model water quality model analog computation;
S04, the selected monitoring station at pollution source place and the simulation terminal in river, described pollution source place that warning occurs, as waiting starting point and the terminal of simulating section, according to described starting point, terminal latitude and longitude information, river moves towards, river plane configuration, the topological relation that the GIS information of automatic monitor station distribution situation is carried out between river course, basin and each monitoring point builds, calculated by GIS spatial analysis and treat that simulation section length and step-length are arranged, in conjunction with one-dimensional stable water quality model, modeling is carried out to simulation of water quality task, to treat that segmentation is carried out according to step information in simulation section, numbering,
Step S04 one-dimensional stable water quality model carries out modeling to simulation of water quality task, comprises the following steps:
One-dimensional water quality model is relatively simple a kind of in water quality model, and be applicable to the small-sized river course that river mean flow rate U is less, the pollutant of side discharge can reach opposite bank in the short period of time, and can with river Homogeneous phase mixing; (S401) one-dimensional stable water quality model differential equation is formula (1):
Non trivial solution is formula (2):
In formula: C is sewage draining exit downstream contamination substrate concentration (mg/L); X be defeated move distance (m); U is river mean flow rate (m/s); K is pollutant overall attenuation coefficient (1/d); Q
p, C
pfor upland water designs the water yield and water concentration (m
3/ s, mg/L); Q
e, C
efor sewage draining exit wastewater discharge and Pollutant emission concentration (m
3/ s, mg/L); Q
pfor upland water designs the water yield, the mean flow rate in the river discharge inputted by S05, river is calculated and obtains, water concentration C
pfor the Mixing Coefficient in Rectangular Channels background concentration of step S05 input,
treat the initial section pollutant levels in simulation section.
For the river that breadth depth ratio is little, pollutant in the short period of time, substantially can in section Homogeneous phase mixing, pollutant levels horizontal change on section is little, can calculate water environment capacity with one-dimensional water quality model simulating pollution thing along the migration problem of river longitudinal direction.
(S402) determine the comprehensive degradation coefficient K of pollutant: when Practical Project uses, according to the historical summary of concrete section, calibration can be carried out to K value, obtain that adjusted stream road is specific geographic, the K value of hydrological environment, improve the simulation accuracy rate of model.The degradation coefficient (the comprehensive degradation coefficient of pollutant) of COD takes experimental formula to be in the present embodiment: K=0.025+0.776U.
According to the situation of reality, calibration can be carried out to parameter, model is demarcated.What adopt in general-purpose computations is that experimental formula is to calculate the comprehensive degradation coefficient of pollutant.
S05, inputs and treats simulation section correlation parameter, specifically comprise the mean flow rate in river discharge, Mixing Coefficient in Rectangular Channels background concentration and river;
S06, calculate pollutant overall attenuation COEFFICIENT K, treat the initial section pollutant levels in simulation section, based on one-dimensional stable water quality model, along journey each step-length node pollutant levels value, analog computation is carried out to simulation section, the array of the numbering that described step S04 generates, step-length and described pollutant levels value composition, result of calculation returns to GIS, and this array is also as the data source (namely showing analog result in the mode of GIS thematic map and list) that interface list is shown simultaneously simultaneously;
S07, GIS map is carried out pollutant levels gradient to simulation section play up according to numbering, step-length, forms Pollutants Diffusion simulation thematic map, analog result is carried out GIS visual presentation, and according to predefined alarm regulation and strategy in advance, carry out pollution source early warning information and study and judge.
Warning message described in step S02 judges for carrying out analysis according to predefined alarm regulation and strategy, when out-of-limit situation occurs monitoring parameter, carry out the warning produced of reporting to the police, described warning message supports multiple alarm mode, comprise alarm window, push away picture, the warning of audio alert, mail, SMS alarm, telephone call.
Alarm regulation and strategy: according to Water-quality control target and the pollution level in region, section, website place, the upper lower limit value of each monitoring parameter alarm level is set respectively.
Described in step S04, GIS spatial analysis Computed-torque control comprises: wait the acquisition of simulating section starting point (sending the sewage draining exit monitoring point of warning) and simulation terminal (lower reaches of river) geographical latitude and longitude coordinates information; Wait the acquisition of simulating section other nodes GIS attribute field; Wait the topology calculate of simulating section length; The conversion of reality coordinate and screen coordinate; The conversion of actual range and screen distance.
Step S07GIS visual presentation specifically comprises the following steps:
(701) analog result calculated by one-dimensional stable water quality model, as discrete points data, obtains the isogram of pollutant levels through difference arithmetic;
(702) described isogram is carried out pollutant levels gradient and color rendering, layer is played up in formation: the upper lower limit value that reference water quality classification specifies, pollutant times of ultra standard and user's request, by business rule, analog result is played up, ascending according to concentration value, river water color changes from shallow to deep;
(703) layer is played up in process: adopt precut mode to cut into slices to map, and stored on the server by the map image cut, shape map is cut into the tile map of different stage, with these tile map base map as a setting.The river of map file or the coordinate geography information in region and correlation attribute value is extracted by GIS service, and pass to backstage advanced analysis service-Engine and carry out analytical calculation, calculate the data type that rear basis returns simulation of water quality evaluation, and create analysis thematic river layer, pollutant levels information is divided according to analog computation, according to step-length, river special layer is played up, the map that is simultaneously added to by special layer carries out visual presentation.System adopts international GIS interface, based on general OGC international norm.
Pollution source early warning information is studied and judged and is comprised the following steps:
One-dimensional stable water quality model is calculated the section each step-length node pollutant levels value returned to contrast with simulation section, terminal place Water-quality control desired value, according to seriousness and the urgency level of the abrupt polluting accident that may cause, determine warning level, carry out grading forewarning system.
The displaying interface of grading forewarning system, by different color shows, is specially: general (iv level, blue); Heavier (iii level, yellow); Seriously (ii level, orange); Especially severe (i level, redness); Early warning information is sent in the mode of page warning pop-up box.Management unit judges to take corresponding contingency management measure according to early warning.
Those skilled in the art can change the present invention or modification design but do not depart from thought of the present invention and scope.Therefore, if these amendments of the present invention and modification belong within the claims in the present invention and equivalent technical scope thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1., based on the pollution source diffusion method for early warning of monitoring water quality on line system, it is characterized in that, comprise the following steps,
S01, the water quality situation of monitoring water quality on line system to monitoring station each in region carries out Real-Time Monitoring;
S02, confirms the pollution source occurring to report to the police: receive the pollution source warning message that monitoring water quality on line system sends, check alert data, confirms transnormal items and times of ultra standard information that the pollution source website of reporting to the police occurs;
S03, obtains the monitoring station at pollution source place and to exceed standard the Real-time Monitoring Data of pollutant, comprise sewage draining exit wastewater discharge Q
ewith website Pollutant emission concentration C
e;
S04, the selected monitoring station at pollution source place and the simulation terminal in river, described pollution source place that warning occurs, as waiting starting point and the terminal of simulating section, according to described starting point, terminal latitude and longitude information, river moves towards, river plane configuration, the topological relation that the GIS information of monitoring station distribution situation is carried out between river course, basin and each monitoring point builds, calculated by GIS spatial analysis and treat that simulation section length and step-length are arranged, in conjunction with one-dimensional stable water quality model, modeling is carried out to simulation of water quality task, to treat that segmentation is carried out according to step information in simulation section, numbering,
S05, inputs and treats simulation section correlation parameter, described in wait to simulate the mean flow rate that section correlation parameter comprises river discharge, Mixing Coefficient in Rectangular Channels background concentration and river;
S06, calculate pollutant overall attenuation COEFFICIENT K, treat the initial section pollutant levels in simulation section, based on one-dimensional stable water quality model, along journey each step-length node pollutant levels value C, analog computation is carried out to simulation section, the array of the numbering that described step S04 generates, step-length and described pollutant levels value composition, result of calculation returns to GIS;
S07, GIS map is carried out pollutant levels value gradient to simulation section play up according to numbering, step-length, forms Pollutants Diffusion simulation thematic map, analog result is carried out GIS visual presentation, and according to predefined alarm regulation and strategy, carry out pollution source early warning information and study and judge.
2. the diffusion of the pollution source based on monitoring water quality on line system method for early warning according to claim 1, it is characterized in that, warning message described in step S02 judges for carrying out analysis according to predefined alarm regulation and strategy, when out-of-limit situation occurs monitoring parameter, carry out the warning produced of reporting to the police, described warning message supports multiple alarm mode, comprise alarm window, push away picture, the warning of audio alert, mail, SMS alarm, telephone call;
Described alarm regulation and strategy are Water-quality control target according to region, section, website place and pollution level, arrange the upper lower limit value of each monitoring parameter alarm level respectively.
3. the diffusion of the pollution source based on monitoring water quality on line system method for early warning according to claim 1, it is characterized in that, described in step S04, GIS spatial analysis Computed-torque control comprises: wait the acquisition of simulating section starting point and the geographical latitude and longitude coordinates information of simulation terminal; Wait the acquisition of simulating section other nodes GIS attribute field; Wait the topology calculate of simulating section length; The conversion of reality coordinate and screen coordinate; The conversion of actual range and screen distance.
4. the diffusion of the pollution source based on monitoring water quality on line system method for early warning according to claim 1, it is characterized in that, described step S04 one-dimensional stable water quality model carries out modeling to simulation of water quality task, comprises the following steps:
(S401) one-dimensional stable water quality model differential equation is formula (1):
Non trivial solution is formula (2):
In formula: C is sewage draining exit downstream contamination substrate concentration; X defeatedly moves distance; U is river mean flow rate; K is pollutant overall attenuation coefficient; Q
p, C
pfor upland water designs the water yield and water concentration; Q
e, C
efor sewage draining exit wastewater discharge and Pollutant emission concentration;
for treating the initial section pollutant levels in simulation section;
(S402) according to the historical summary of concrete section, calibration is carried out to K value, obtain that adjusted stream road is specific geographic, the K value of hydrological environment.
5. the diffusion of the pollution source based on monitoring water quality on line system method for early warning according to claim 1, it is characterized in that, described step S07GIS visual presentation specifically comprises the following steps:
(701) analog result calculated by one-dimensional stable water quality model, as discrete points data, obtains the isogram of pollutant levels through difference arithmetic;
(702) described isogram is carried out pollutant levels gradient and color rendering, layer is played up in formation: the upper lower limit value that reference water quality classification specifies, pollutant times of ultra standard and user's request, by business rule, analog result is played up, ascending according to concentration value, river water color changes from shallow to deep;
(703) layer is played up in process: adopt precut mode to cut into slices to map, and the map image cut is stored on the server, map is cut into the tile map of different stage, with described tile map base map as a setting, the river of map file or the coordinate geography information in region and correlation attribute value is extracted by GIS service, carry out the evaluation of analytical calculation simulation of water quality, calculate the data type that rear basis returns simulation of water quality evaluation, create and analyze thematic river layer, pollutant levels information is divided according to analog computation, according to step-length, river special layer is played up, special layer is added on map and carries out visual presentation.
6. the diffusion of the pollution source based on monitoring water quality on line system method for early warning according to claim 1, it is characterized in that, described pollution source early warning information is studied and judged and is comprised the following steps:
One-dimensional stable water quality model is calculated the section each step-length node pollutant levels value returned to contrast with simulation section, terminal place Water-quality control desired value, according to seriousness and the urgency level of the abrupt polluting accident that may cause, determine warning level, carry out grading forewarning system.
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